121221020201021 has 32 divisors (see below), whose sum is σ = 135796933523328. Its totient is φ = 107482261098240.

The previous prime is 121221020201003. The next prime is 121221020201053. The reversal of 121221020201021 is 120102020122121.

It is a cyclic number.

It is not a de Polignac number, because 121221020201021 - 2¹⁸ = 121221019938877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221020251021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183361355 + ... + 184021271.

It is an arithmetic number, because the mean of its divisors is an integer number (4243654172604).

Almost surely, 2^{121221020201021} is an apocalyptic number.

It is an amenable number.

121221020201021 is a deficient number, since it is larger than the sum of its proper divisors (14575913322307).

121221020201021 is a wasteful number, since it uses less digits than its factorization.

121221020201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665421.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121221020201021 its reverse (120102020122121), we get a palindrome (241323040323142).

The spelling of 121221020201021 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred one thousand, twenty-one".